Asset Quality and Allowances for Loan and Lease Losses and Unfunded Loan Commitments and Letters Of Credit (Rollforward of Allowance for Loan and Lease Losses and Associated Loan Data) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010	Dec. 31, 2010
Beginning Balance	$ 4,887	[1]	$ 5,072
Charge-offs	(1,258)		(1,812)
Recoveries	311		281
Net charge-offs	(947)		(1,531)
Provision for credit losses	701		1,574
Adoption of ASU 2009-17, Consolidations			141
Other			2
Net change in allowance for unfunded loan commitments and letters of credit	(14)		78
Ending Balance	4,627	[1]	5,336
TDRs individually evaluated for impairment - associated allowance	577		159
Other loans individually evaluated for impairment - associated allowance	705		987
Loans collectively evaluated for impairment - associated allowance	2,396		3,331
Purchased impaired loans - associated allowance	949		859
TDRs individually evaluated for impairment	1,919		829
Loans collectively evaluated for impairment	138,699		140,650
Other loans individually evaluated for impairment	2,445		3,736
Purchased impaired loans	7,256		9,127	7,780
Total Loans	150,319	[1],[2],[3],[4]	154,342	150,595	[1],[2],[3],[4]
Ratio of the allowance for loan and lease losses to total loans	3.08%		3.46%
Segment ALLL as a percentage of total ALLL	100.00%		100.00%
TOTAL COMMERCIAL LENDING [Member]
Beginning Balance	2,567		3,345
Charge-offs	(671)		(1,052)
Recoveries	242		211
Net charge-offs	(429)		(841)
Provision for credit losses	242		665
Other			2
Net change in allowance for unfunded loan commitments and letters of credit	11		78
Ending Balance	2,391		3,249
TDRs individually evaluated for impairment - associated allowance	27		14
Other loans individually evaluated for impairment - associated allowance	705		987
Loans collectively evaluated for impairment - associated allowance	1,382		1,903
Purchased impaired loans - associated allowance	277		345
TDRs individually evaluated for impairment	305		54
Loans collectively evaluated for impairment	77,279		75,831
Other loans individually evaluated for impairment	2,445		3,736
Purchased impaired loans	1,120		1,605
Total Loans	81,149		81,226
Ratio of the allowance for loan and lease losses to total loans	2.95%		4.00%
Segment ALLL as a percentage of total ALLL	51.67%		60.89%
TOTAL CONSUMER LENDING [Member]
Beginning Balance	2,320		1,727
Charge-offs	(587)		(760)
Recoveries	69		70
Net charge-offs	(518)		(690)
Provision for credit losses	459		909
Adoption of ASU 2009-17, Consolidations			141
Net change in allowance for unfunded loan commitments and letters of credit	(25)
Ending Balance	2,236		2,087
TDRs individually evaluated for impairment - associated allowance	550		145
Loans collectively evaluated for impairment - associated allowance	1,014		1,428
Purchased impaired loans - associated allowance	672		514
TDRs individually evaluated for impairment	1,614		775
Loans collectively evaluated for impairment	61,420		64,819
Purchased impaired loans	6,136		7,522
Total Loans	$ 69,170		$ 73,116
Ratio of the allowance for loan and lease losses to total loans	3.23%		2.85%
Segment ALLL as a percentage of total ALLL	48.33%		39.11%

[1] Amounts represent the assets or liabilities of consolidated variable interest entities (VIEs).

[2] Amounts represent items for which the Corporation has elected the fair value option.

[3] Future accretable yield related to purchased impaired loans is not included in loans outstanding.

[4] Net of unearned income, net deferred loan fees, unamortized discounts and premiums, and purchase discounts and premiums totaling $2.5 billion and $2.7 billion atJune 30, 2011 and December 31, 2010, respectively.